<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body></body>
    <button>按钮1</button>
    <button>按钮2</button>
    <button>按钮3</button>
    <script src="jquery.js"></script>
    <script>
        $("button").click(function(){
            console.log("hello,world")
        })
    </script>
</body>
</html>